load and manage stores in dropdownlists

1. i have a problem whit loading store items in a dropdown list what have i to do?
2. how can i rename the back button text? defaultBackButtonText won't work
3. in the moment i'm testing it by myself
4. is there an example to list stores like the example for sencha touch 1.x?

many examples that i saw are whit entries in the store. i shoud have an empty store for my app. i fill the store at point 4.

Unfortunately the defaultBackButtonText on the navigation view doesn't get set on the navigation bar until after everything so the code above in red will set the defaultBackButtonText at navigation bar creation.

For dropdown lists... do you mean selectfield otherwise I'm not sure what you are talking about.

For list stores, so you just want to know how to add data to a store after the store is created?